clear QList method
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i have a QList member of ClassA, what should i do if i want to clear this QList?
(1)m_listA.clear()(2)QList<A*>().swap(m_listA)
(3)for (QList<A>::iterator it = m_listA.begin(); it != m_listA.end(); it++)
{
A* a= it;
if (a)
{
delete a;
a = NULL;
}
}
//clear
if (!m_listA.isEmpty())
QList<A>().swap(m_listA);which is the best and efficient way to do this , thank you!
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Hi,
You can use QList::clear() if you want to remove all the items from your list.
If you want to remove only few specific contents you can use QList::remveAll(const T &value).
And also there is a function qDeleteAll from which you can delete the contents of list -
how about the pointer?
i use QList<A*>
should i write like this：
for (QList<A*>::iterator it = m_listA.begin(); it != m_listA.end(); it++)
{
A* a= *it;
if (a)
{
delete a;
a = NULL;
}
}
//clear
if (!m_listA.isEmpty())
m_listA.clear(); -
Hi,
qDeleteAll is perfectly suited for that
